All Nocks Are Not Created Equal A Precision Nock will fit arrow to bowstring tightly, yet with enough space to allow for a natural draw and release. An overly tight or loose fitting nock can negatively impact arrow flight and accuracy. In the middle of a hunt or at a competition, I know that I can pull one LAUNCHPADPrecise contact points for controlled arrow release.Concentric design to center the nock in the arrow shaft for more consistent performance.Aligned nock barrel for true arrow flight.The LAUNCHPAD Nock delivers precision engineering and perfect balance that ensures superior accuracy for truest flights.Strength and Durability All Carbon Express nocks are made of polycarbonate for strength and durability.Available in size: .24412 per pack